Police on Wednesday arrested an Iranian man on suspicion of murdering one of his compatriots in 2015 in Nagoya, central Japan.

Seyedmohsen Rezaeikelidbari, 33, allegedly conspired with others to stab a 27-year-old man identified as Anami Shirmard Milad on a street in Nagoya around 1:30 a.m. on Dec. 20, the police said.

The police suspect the incident was a result of a drug trafficking dispute, with several people later arrested and convicted in connection with the assault.

Rezaeikelidbari was arrested in March on a separate charge, on suspicion of illegally staying in Japan, according to investigative sources.